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Class 10
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Ohm's Law
Ohm's Law
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1)
Which Law explains the following. At constant temperature the current flowing through a conductor is directly proportional to the potential difference between its ends.
Ohm’s Law
Charle’s Law
Joule’s Law
Boyle’s Law
2)
The current through a wire depends on?
The resistance of the wire.
The potential difference applied.
Both resistance and potential difference.
The thickness of the wire.
3)
Which of the following is an example for Ohmic resistor?
Diode
Nichrome
Germanium
Diamond
4)
What is reciprocal of resistivity called?
Conductance
Specific resistance
Conductivity
Capacitance
5)
Which of the following statement does not represent Ohm's Law?
potential difference/resistance = current
potential difference / current = resistance
current = resistance x potential difference
potential difference = current x resistance
6)
The work done in moving a unit positive charge across two points in an electric circuit is a measure of ___________.
current
potential difference
resistance
power
7)
The potential at a point is 20 V. The work done to bring a charge of 0.5 C from infinity to this point will be ________.
20 J
10 J
5 J
40 J
8)
The device used for measuring potential difference is known as _____________.
potentiometer
ammeter
galvanometer
voltmeter
9)
The unit of resistivity is ____________. Answer: 3
ohm
ohm / m
ohm-m
mho
10)
The unit of current is _____________.
ampere
watt
volt
coulomb
11)
Two electric bulbs of 100 W, 200 V are put in series and the combination is supplied 100 V. The power consumption of each bulb will be
100 / 2 W
100 / 4 W
100 / 8 W
100 / 16 W
12)
Ohm's law is not applicable to
DC circuits
high currents
small resistors
semi-conductors
13)
Resistance of a wire is r ohms. The wire is stretched to double its length, then its resistance in ohms is
(A) r / 2
(B) 4 r
(C) 2 r
(D) r / 4.
14)
Resistivity of a wire depends on
length
material
cross section area
none of the above.
15)
Ohm's law is a relationship between
voltage, current, and time
power, current, and resistance
resistance, time, and current
voltage, current, and resistance
16)
If current through a resistance is halved
the resistance is halved
the voltage is halved
the voltage doubles
none of the above
17)
Ohm's law describes the mathematical relationship between
ohms, kilohms, and megohms
resistor size and resistor value
resistance, voltage, and current
none of the above
18)
If voltage across a resistance doubles
the current is halved
the resistance doubles
the current is unchanged
none of the above
19)
If the resistance in a circuit with constant voltage increases, the current will
increase
decrease
stay the same
Not enough information
20)
If doubling the voltage across a resistor doubles the current through the resistor then
the resistor value decreased
the resistor value did not change
the resistor value increased
it is impossible to determine the change in t